напиши письмо на английском языке, 60-70 слов используя to be going to

Sure! Here's a 60-70 word letter in English using "to be going to."

Dear Emily,

How are you? I am very excited because I am going to visit your city next month. I am going to stay with my aunt for a week. We are going to visit some famous places and enjoy local food. I am sure we are going to have a lot of fun! I can’t wait to see you soon.

Best wishes,
[Your Name]

If you want the letter to be about a different topic or need it more formal/informal, just let me know!